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nRF24L01+ missing ACKs

Milek7

I have two nRF24L01+, one as PTX and one as PRX. Both have following config: EN_RXADDR = ERX_P0, EN_AA = ENAA_P0, RF_CH = 100, RF_SETUP = 0x26, SETUP_RETR = 0xF0, SETUP_AW = 1, RX_ADDR_P0 = 0xAB 0xCD 0x00, TX_ADDR = 0xAB 0xCD 0x00, RX_PW_P0 = 8. All packets are received by PRX, but about 40% are marked by PTX as lost. If I change speed to 1Mbps, then missing ACK rate lowers to 10%.

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